Well worth it, and now with Wiki
It's a great product and we're now using it for commercial applications. We only have to develop one application and it can run across a wide range of platforms.
There were a few features it didn't have - but we soon added those thanks to Open Source and SuperWaba's ability to support native libraries.
Deploying many files and a copy of SuperWaba to clients has been simplified by using package installers like CrunchIt for WinCE/PocketPC and Nutshell for PalmOS.
The Jump compiler looks useful too, though I've not explored it much. I've taken to using the Wiki site a lot; there's a very extensive FAQ there.
An open, cross-platform journaling program.
A scientific plotting package.